The fastness to sunlight of textiles has been paid more and more attention at home and abroad. At present, China's textile industry product standards, especially new standards (except underwear standards) promulgated in recent years, take light fastness as one of the evaluation standards. For example, the silk product standards previously issued in China did not provide for the evaluation of light fastness, but the light fastness of elastic silk has been issued as an assessment index. In the standards for chemical fiber silk fabrics and cotton products, light fastness is also used as an important assessment index, and even some product standards also use light fastness as an assessment index.
Under the background of new requirements and standards for solar fastness at home and abroad, textile companies in China must understand and master the test standards and technical requirements for solar fastness in order to ensure product quality. LIB explores the color fastness of the sun from various aspects such as test standards and technical parameters.
Domestic current effective sun fastness tester test method standards:
Light fastness: Daylight refers to the exposure to sunlight under prescribed conditions that are not subject to rain, and then the light fastness to light is evaluated with reference to the blue wool standard.
Color fastness to artificial light: Xenon arc refers to exposure to artificial light sources equivalent to sunlight under prescribed conditions, and then reference to the blue wool standard to evaluate light fastness.
Weather fastness: Outdoor exposure refers to exposure in the open air under the prescribed conditions without any protection, and then compared with the blue wool standard to evaluate its color fastness.
Color fastness to artificial climate: Xenon arc refers to spray exposure in a xenon lamp tester under specified conditions, and then compared with the blue wool standard to evaluate color fastness.
Color fastness to light and sweat: Expose the sweat-treated sample to the instrument, and then evaluate its light fastness and light-fast, sweat composite color fastness, and determine its sensitivity to light. Among them, the xenon arc in the color fastness to artificial light is the most commonly used standard. Most of our textiles are tested according to the methods in this standard when evaluating the light fastness.
American sun fastness tester related standards:
Lightfastness and color fastness, suitable for interior textiles.
Weatherability of fabric: Xenon arc, suitable for outdoor textiles.
Among them, light fastness and color fastness are a widely used textile light stability standard.
Its main measurement range:
1. Dye fastness test: Dye fastness test under light (wavelength: 380nm ~ 750nm) and certain temperature and humidity conditions.
2. The weather fastness test of dyes: The weather fastness of dyes is determined under the combined effects of light (wavelength 380nm ~ 750nm) and certain temperature and humidity and rain.
3. Weather fastness test of textiles: The weather fastness of textiles is measured under the combined action of light (wavelength: visible light 380nm ~ 750nm; ultraviolet light 300nm ~ 380nm) and climatic conditions.
The best way to test the color fastness to the sun:
Testing the fabric's response to light is probably one of the most important test items in all the color fastness tests. Of course, for manufacturers, the performance of fabrics in washing, dry cleaning, rubbing, sweating, and subsequent exposure to different types of solutions is vital information. But because fabrics are sensitive to light and difficult to predict, accurate and reliable testing is critical.
For many manufacturers, sun fastness testing is an important part of R & D and quality control. However, it is also one of the most difficult tests to master. Because it takes months or even years for most materials to respond under daylight, it is not feasible to test fabrics in natural applications under natural light. Not to mention how many R & D departments are willing to wait patiently?
Many manufacturers choose a laboratory for testing. They simulate natural light to speed up the testing process. The most successful technique is the xenon long arc radiation method. This unique and reliable method of simulating the reconstructed natural light spectrum uses various filters to reproduce special optical conditions.
The sun fastness test is not as simple as putting the fabric under a specific light source to observe its performance. Temperature and humidity must also be taken into account, because temperature and humidity have a greater effect on the fabric's response to light. Therefore, the sun fastness tester must be able to control these environmental factors, that is, to create the corresponding environmental conditions for each test, and maintain constant throughout the process.
In addition, if a certain fabric is used outdoors, then weather factors, especially rainy weather, are another issue that must be considered. Therefore, the device must include a sprinkler system that simulates rainy weather, as well as climatic conditions in different parts of the world.
Solar fastness test equipment:
Accelerated Weathering Test Chamber is specially designed for the sun test standard of dyes, textiles and automotive interiors. Comply Standards: AATCC TM16,AATCC TM169,ASTM C1257,ASTM C1442,ASTM C1519,ASTM C732,ASTM C734,ASTM C793,ASTM D1148,ASTM D1670,ASTM D2565,ASTM D3424,ASTM D3451,ASTM D4101,ASTM D4303,ASTM D4355,ASTM D4434,ASTM D4459,ASTM D4798,ASTM D4811,ASTM D5019,ASTM D5071,ASTM D5383,ASTM D5398,ASTM D5819,ASTM D6083,ASTM D6551,ASTM D6577,ASTM D6662,ASTM D6695,ASTM D6878,ASTM D7356,ASTM D750,ASTM D7869,ASTM D882,ASTM D904,ASTM D925,ASTM F1164,ASTM F1515,ASTM F2366,ASTM G151,ASTM G155,GM 9125P,ISO 105-B07/B10,ISO 11341,ISO 12040,ISO 29664,ISO 4892-1 ,ISO 4892-2 ,SAE J2412,SAE J2527,VW PV 1306,VW PV 3929,VW PV 3930 etc.
The test chamber xenon lamp tube is used to simulate the sunlight, and water spray is simulated to dew the river rain, the realistic reproduction of the damage received by the material in a daily environment.
